There is a 2D array of x and y positions of a vehicle measured at an interval of one second, e.g.: x y 1, 5 1, 6 1.5, 6.8 ... I need to somehow quantify how a given driver approaches curves (i.e. driving style - does he/she drives aggressively or not). For this, I divided the problem into two sub-problems: Step 1: Define curves by estimating angles Step 2: Estimate the speed change or acceleration at these curves. I am not sure that my approach is the best one. I would appreciate a link to some online resource where similar problem is discussed. I also appreciate any idea of how to evaluate a driving style at curves. Finally, I don't know how to perform Step 1, so any help is welcome.